mirror of
https://github.com/d0k3/GodMode9.git
synced 2025-06-26 13:42:47 +00:00
86 lines
2.6 KiB
C
86 lines
2.6 KiB
C
#include "image.h"
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#include "platform.h"
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#include "ff.h"
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static u8* ramdrv_buffer = NULL;
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static u32 ramdrv_size = 0;
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static FIL mount_file;
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static u32 mount_state = 0;
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int ReadImageSectors(u8* buffer, u32 sector, u32 count) {
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UINT bytes_read;
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UINT ret;
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if (!count) return -1;
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if (mount_state == IMG_RAMDRV) {
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if ((sector + count) * 0x200 > ramdrv_size) return -1;
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memcpy(buffer, ramdrv_buffer + (sector * 0x200), count * 0x200);
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return 0;
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}
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if (!mount_state) return FR_INVALID_OBJECT;
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if (f_tell(&mount_file) != sector * 0x200) {
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if (f_size(&mount_file) < sector * 0x200) return -1;
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f_lseek(&mount_file, sector * 0x200);
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}
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ret = f_read(&mount_file, buffer, count * 0x200, &bytes_read);
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return (ret != 0) ? (int) ret : (bytes_read != count * 0x200) ? -1 : 0;
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}
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int WriteImageSectors(const u8* buffer, u32 sector, u32 count) {
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UINT bytes_written;
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UINT ret;
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if (!count) return -1;
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if (mount_state == IMG_RAMDRV) {
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if ((sector + count) * 0x200 > ramdrv_size) return -1;
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memcpy(ramdrv_buffer + (sector * 0x200), buffer, count * 0x200);
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return 0;
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}
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if (!mount_state) return FR_INVALID_OBJECT;
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if (f_tell(&mount_file) != sector * 0x200)
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f_lseek(&mount_file, sector * 0x200);
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ret = f_write(&mount_file, buffer, count * 0x200, &bytes_written);
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return (ret != 0) ? (int) ret : (bytes_written != count * 0x200) ? -1 : 0;
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}
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int SyncImage(void) {
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return (mount_state == IMG_RAMDRV) ? FR_OK :
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mount_state ? f_sync(&mount_file) : FR_INVALID_OBJECT;
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}
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u64 GetMountSize(void) {
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return (mount_state == IMG_RAMDRV) ? ramdrv_size :
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mount_state ? f_size(&mount_file) : 0;
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}
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u32 GetMountState(void) {
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return mount_state;
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}
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u32 MountRamDrive(void) {
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if (mount_state && (mount_state != IMG_RAMDRV))
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f_close(&mount_file);
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if (GetUnitPlatform() == PLATFORM_3DS) {
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ramdrv_buffer = RAMDRV_BUFFER_O3DS;
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ramdrv_size = RAMDRV_SIZE_O3DS;
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} else {
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ramdrv_buffer = RAMDRV_BUFFER_N3DS;
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ramdrv_size = RAMDRV_SIZE_N3DS;
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}
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return (mount_state = IMG_RAMDRV);
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}
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u32 MountImage(const char* path) {
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u32 type = IdentifyFileType(path);
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if (mount_state) {
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if (mount_state != IMG_RAMDRV) f_close(&mount_file);
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mount_state = 0;
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}
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if (!path || !type) return 0;
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if ((type != IMG_FAT) && (type != IMG_NAND)) return 0;
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if (f_open(&mount_file, path, FA_READ | FA_WRITE | FA_OPEN_EXISTING) != FR_OK)
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return 0;
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f_lseek(&mount_file, 0);
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f_sync(&mount_file);
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return (mount_state = type);
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}
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